LINES GP-LOAD CONTROL VALVE 3403048 - Caterpillar

Table 2
Common Chemical Wear Factors
Item No Action Required Monitor Action Required
Oxidation(1) ≤ 23 UFM 24-33 UFM ≥ 34 UFM
Sulfation ≤ 27 UFM 28-33 UFM ≥ 34 UFM
Viscosity < 2 cSt 2 cSt ≥ 3 cSt
(1) Use these oxidation guidelines if the new oil oxidation value is unknown. If the new oxidation value is known, add 10 to the new oil value for "monitor" guideline. Add 20 to the new oil value for the "action required" guideline.Table 2 lists factors related to the proper chemistry of diesel engine oil and certain guidelines for monitoring those factors.Soot is a product of unburned fuel and is produced by all diesel engines. Soot is an abrasive that becomes more damaging to engine components if soot particles are allowed to agglomerate to form larger particles. All diesel engine oils contain dispersants to keep soot particles from sticking together. When engine oil is contaminated with soot, abrasive mechanical wear accelerates. Soot tends to be produced more readily in engines operating at high altitudes and/or having lower than optimal boost pressure. Soot is one of the reasons that recommended oil change intervals for products operating at high altitudes are reduced relative to the oil change intervals of similar products operating at low altitudes.
Illustration 10 g03403376Oil deterioration and accumulation of soot often results from broken rings and/or worn liners that allow excessive blowby. Refer to Special Instruction, REHS7857, "Testing for Excessive Cylinder Blowby in 3500 Engines" for guidance in identifying cylinders plagued with broken rings and/or worn liners.Resolve and Proceed
Table 3
Quick Reference Troubleshooting Guide
Oil Analysis Result Probable Cause Notes and References Recommended Action
High Pb and high Si, Al Mechanical Wear : Dirt/Debris Introduced Through Service or Operations Review service and maintenance practices. Inspection of magnetic plugs and oil filter elements are recommended. Alter service or maintenance practices to eliminate dirt/debris introduction. Resample oil to confirm wear metal concentrations return to acceptable levels. Consider bearing replacement if the dirt/debris introduction was severe (high concentration, long duration, and so on) and/or if the engine is not close to PCR target.
High Pb and high Si, Al, Fe, Cr Mechanical Wear : Dirt Ingestion Through the Air System Refer to Service Magazine, SEPD0712, "Procedure to Test Air Induction System". Repair source of dirt ingestion and resample oil to confirm wear metal concentrations return to acceptable levels. Consider bearing replacement if the dirt ingestion was severe (high concentration, long duration, and so on) and/or if the engine is not close to PCR target.
High Pb and high Cu Mechanical Wear : Thrust Bearings or Bushings Bushings, bearings, and thrust washers in rear gear train and air compressors are common sources. Larger particles can often be observed in filter media. Check filter media and magnetic plugs for presence of larger particles. Replace worn components and resample oil to confirm wear metal concentrations have returned to acceptable levels.
High Pb Only Mechanical and/or Chemical Wear : Extended Oil Change Interval, Abnormal Operating Conditions, Out of Specification or End of Life Components Missed oil changes